1. Bell, Daniel. 1967.The End of Ideology: On the Exhaustion of Political Ideas in the Fifties,, rev. ed., 397New York: Free Press.
2. Heberle, Rudolf. 1951.Social Movements, 13New York: Appleton‐Century‐Crofts.
3. Campbell, Joseph, Elgin, Duane, Harman, Willis, Hastings, Arthur, Markley, O. W., Matson, Floyd, O'Regan, Brendan and Schneider, Leslie. 1974.Changing Images of Man, Policy Research Report 4 82–83. Menlo Park, Ca.: Center for the Study of Social Policy, Stanford Research Institute.